Towel bar



FIG. 1 is a top view of our new design for a towel bar;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side being the same as the right side; and,

FIG. 5 is a perspective view thereof. 

The ornamental design for a towel bar, as shown and described. 